AirHint found the following cheapest return flights from Seoul (GMP) to London (LHR) in December 2025 (see full year).

Return flights

16 Dec - 23 Dec	Air China
16 Dec - 27 Dec	Air China
03 Dec - 31 Dec	Air China
16 Dec - 24 Dec	Air China
17 Dec - 24 Dec	Air China
13 Dec - 23 Dec	Air China
16 Dec - 26 Dec	Air China
16 Dec - 03 Jan	Air China
13 Dec - 26 Dec	Air China
17 Dec - 31 Dec	Air China
15 Dec - 26 Dec	Air China
18 Dec - 02 Jan	Air China
03 Dec - 03 Jan	Air China
20 Dec - 08 Jan	Air China
23 Dec - 14 Jan	Air China
28 Dec - 09 Jan	Air China
28 Dec - 08 Jan	Air China
30 Dec - 03 Jan	Air China
28 Dec - 07 Jan	Air China
25 Dec - 03 Jan	Air China

Also check the deals for one-way flights from Seoul to London in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Seoul to London in December from $710

Return flights